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You can't collect them, however; I believe that you can pick them up using the portal gun. There is also a mod called Soul Shards, which allows you to create spawners. I'm not 100% sure how that works though.
Okay, so FTB does mess with spawners a bit. First, we need to establish what pack you are on. If you are on Beta Pack A, then it has the Portal Gun mod, if you are on Magic World it has Soul Shards (I think) and Mindcrack has Soul Shards and Portal Gun may be added although it has had a complete rewrite.
If you have the Portal Gun mod, by pointing the portal gun at a block and pressing your G key, it will pick it up similar to the way you can pick up Safety Cubes in the Portal series, and then you can press G to place it down elsewhere. This feature may have been nerfed in the rewrite, I'm not sure.
This documentation has info for the previous version (the one in Beta Pack A and Magic World) http://www.minecraftforum.net/topic/199391-146smpforge-portal-gun-reconstructed-v1-rewritten-again/
As far as I know, there is nothing else that uses spawners in any special way in the current FTB packs.
EDIT: Added Portal Gun link
EDIT 2: Portal Gun is not in Magic World
If you have the Portal Gun mod, by pointing the portal gun at a block and pressing your G key, it will pick it up similar to the way you can pick up Safety Cubes in the Portal series, and then you can press G to place it down elsewhere.
If you have redpower (minecrack/dire) you can pick them up with frames.
Has anyone tested the GT rockcutter? I dont think they can be silktouched, but I'm not 100% on that one.
(Rizgumi's spawner GUI might be compatible- very useful for this kind of thing)